Camille Grammer; CNN anchor Anderson Cooper.

Musician Robin Thicke; actress Katrina Bowden

Actress Rosie Perez; "Top Chef's" Hugh Acheson.

Talk show host Rosie O'Donnell.

Actress Nene Leakes.

Reality stars Kyle Richards and Mauricio Umansky.

Television mentor Tabatha Coffey; actor RuPaul; comic Sandra Bernhard.

Comic Jimmy Fallon.

Actor Ralph Fiennes; actress Holly Hunter.

Actress Yvette Nicole Brown; TV host Sherri Shepherd.

TV reality stars Lisa Vanderpump and Brandi Glanville.

Musician Mary J. Blige.

Chefs Gail Simmons and Fabio Viviani.

Actress Emmy Rossum; actor Alan Cumming.

Kim Zolciak and Kroy Biermann.

Designer Brad Goreski; producer Gary Jaretti.

Abby Elliott and Vanessa Bayer.

Chef Tom Colicchio; Chef Carla Hall.

Reality TV stars Snooki and JWoww.

Actress Sarah Michelle Gellar; screenwriter Ryan Murphy.

Reality TV stars Taylor Armstrong and Gretchen Rossi.

Actress Padma Lakshmi; actor Michael Showalter.

Actor Daniel Radcliffe.

Reality TV star Phaedra Parks and musician Gloria Estefan.

Actress Busy Philipps and actor David Arquette.

Andy felt the love on the special Valentine's Day one-hour episode of WWHL.

Musician Lil Kim and TV host Willie Geist.

Andy Cohen interviews Joan Rivers.

Sheree and Jackee appeared on the Feb. 19, 2012 episode of 'Watch What Happens: Live.'

Reality TV star Bethenny Frankel.

Comic Billy Eichner; reality TV star Tamra Barney.

Musician John Legend and his wife, model, Chrissy Teigen.

Lisa Kudrow and Jesse Tyler Ferguson.

Actress Megan Hilty; musician Nick Jonas.

Actress Jackie Collins; actress Ali Wentworth.

The final two Top Chef contestants. Sarah Grueneberg and Paul Qui.

TV host Nancy Grace; TV personality Kris Jenner.

Reality TV star Kandi Burruss.

Fran Drescher; Lori Zaslow.

Actress Lisa Rinna; reality TV star Alexis Bellino.

Actor Mark Consuelos; TV personality Martha Stewart.

Deena Cortese and Wilmer Valderrama.

Reality TV stars Nene Leakes and Reza Farahan.

Socialite Nicole Richie; professional hockey player Sean Avery.

Actress Wendi McLendon-Covey; Reality TV star Vicki Gunvalson.

TV host Jeff Lewis; actress Kristen Johnston.

Cee Lo Green and "Big Ang" Railoa play "Plead the Fifth."

Reality TV stars Cynthia Bailey and Coco T.

Actress Casey Wilson; actress Tamar Braxton.

Actress Jenna Jameson; musician Clay Aiken.

Reality TV stars Ryan Serhant, Fredrik Eklund and Michael Lorber.

J.B. Smoove; Shannon Elizabeth.

Reality TV stars Golnesa "GG" Gharachedaghi and Phaedra Parks.

Actress Shannen Doherty; actress Giuliana Rancic.

Actor Chris Klein; actress Tori Spelling.

The Real Housewives perform and Bravo's celebrities make appearances.

Comic Kathy Griffin.

Mercedes "MJ" Javid and Sammy Younai play "Plead the Fifth."

Monica talks about relationships; John Hickey reads a camp letter from a young Andy.

Actress Kristin Chenoweth; reality TV star Jeana Keough.

Actress Martha Plimpton; actor Billy Eichner.

Comic Rachel Dratch; actress Cheryl Hines.

Reality TV stars Reza Farahan, Asa Soltan Rahmati and Mike Shouhed.

Actor John Slattery; actress Rashida Jones.

Andy Cohen interviews Ana Gasteyer and Loretta Devine.

TV host Rachel Maddow; reality TV star Jenni Pulos.

Talk show host Ricki Lake; reality TV star Jaleel White.

Reality TV star Caroline Manzo and Khloe Kardashian Odom.

Actor Wayne Brady; Actress Kate Walsh.

Reality TV stars Vicki Gunvalson and Lauri Peterson.

Actor James Van Der Beek; actress Gabourey Sidibe.

Actress Jenna Fischer; Musician Jason Mraz.

Reality TV Star Jacqueline Laurita: TV personality Kelly Osbourne.

Actress Kathleen Turner; actress Jennifer Tilly.

Comic Heather McDonald; reality TV star Tamra Barney.

Ryan Serhant, Michael Lorber and Fredrik Eklund.

Actress Susan Lucci; Actor Mark Ruffalo.

Andy Cohen interviews Joe and Melissa Gorga.

Kelly Ripa and Anderson Cooper play games and give advice.

Chef Cat Cora; reality TV star Alexis Bellino.

Actress Rita Wilson; celebrity chef Curtis Stone.

Wendy Williams plays "Plead the Fifth."

Kathy Wakile; Rosie Pierri.

Comic Jerry Seinfeld; actor Matthew Broderick.

Actress Heather Dubrow; Dr. Mehmet Oz.

Musician John Mayer; Journalist Dan Rather.

Musicians Beth Ditto and Adam Lambert.

Comic Margaret Cho; designer Rosie Pope.

Actors Steve Guttenberg and Joey Lawrence.

Mindy Cohn and Kim Fields talk about their time on "The Facts of Life."